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问题 选择题

下列表述中，合理的是（　　）

A．把SO2通入品红试液，可验证SO2水溶液的酸性

B．构成如右图所示装置时，盐桥中的K+移向ZnSO4溶液

C．配制一定物质的量浓度的溶液，定容时俯视容量瓶的刻度线，会使所配溶液的浓度偏低

D．已知：

则

答案

答案：D

选择题
一 My father is seriously ill and has been to the hospital.
— _____

A. Really?
B. I'm sorry to hear that.
C. That's nothing serious.
D. So do I.
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单项选择题

Which of the following statements is true regarding the Student’s t-distribution, as the degrees of freedom become larger: （）

A. Confidence intervals based on the Student’s t-distribution become larger. 

B. Sample sizes of the Student’s t-distribution become smaller. 

C. The Student t-distribution approaches a standard normal distribution.
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